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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS (In millions)
Column A |  | Column B |  | Column C |  | Column D |  | Column E
Description |  | Balance at Beginning of Period |  | Provision/reversals Charged to Costs & Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2020 |  | $ | 18 |  |  | $ | (3) |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
Year ended December 31, 2019 |  | $ | 14 |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | 18 |
Year ended December 31, 2018 |  | $ | 12 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 14 |
Deferred tax valuation allowance |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2020 |  | $ | 45 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 51 |
Year ended December 31, 2019 |  | $ | 39 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 45 |
Year ended December 31, 2018 |  | $ | 32 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 39 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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